S, W. Johnson on Assimilation of bodies by Vegetation. 29 
In the e of the four experiments under notice, the weight 
of the crops pe dist at 212° I’.), exclusive of the fine rootlets that 
could not be removed from the soil, was ascertained with the 
subjoined results. 
Weight of dried crop,. 0°1935 grm. 
No, 1, (no added nitrogen,) ¢ 8 A ee: 2A 
gai “00292 
Weight of dried ES 1-9470 orm. 
No. 2, (added 0420 grm. uric acid,) “ eed, “1725 
er “14745 
Weight of dried a. 10149 grm. 
No. 3, (added 1-790 grm. hippuric acid),“ 01752 * 
gain, “08397 
No. 4, (added 0-411 grm. hydro- 
Weight * dried crop, 0°9820 grm. 
chlorate of guanine,) t sects eu rene 
"0-8122 8122 “ 
We thus have proof that all the cctibes employed contrib- 
uted nitrogen to the growing plant. This is conclusivel aie 
by the fact that the mites ety of pistillate organs, whit is are 
especially rich in nitrogen, occurred in the three plants fed with 
nitrogenous compounds, but wie totally wanting in the other. 
The relation of matter new-organized by growth to that derived 
m the seed is strikingly seen from a comparison of the ratios 
of the weight of the seed to the increase of organized matter, the 
former being taken as unity. 
The ratio is approximatively 
for No. 1, +> oe 
eae 1... : 102 
te 3, tae os 
“6 4, Lo. ee 
Bay relative gain nt pos that of -— 1, assumed as unity, 
= eo . 5 
ie Mee. 26 
ee 26 
_ No examination was at of the soil to ascertain eaeeel . 
uric aia, ke, had cesoraute asa with formatio 
ieihen’s 
Part, it is not to be anticipated that the more stable bodies em- 
ployed ed in these trials should wm such alteration. 
